METHOD AND DEVICE FOR CONSTRUCTING SHIELD TUNNEL WITH DIFFERENT DIAMETER AND SHAPE USING SINGLE SHIELD MACHINE

摘要

PROBLEM TO BE SOLVED: To facilitate construction work of tunnels with different shaft diameters by installing an inner cylinder inside a shield, and coupling or separating the inner cylinder to or from a shield machine when the cross section of the shield is varied. ;SOLUTION: To switch construction of a small-diameter tunnel to that of a large-diameter tunnel, a front line of small-diameter segments 20 and an inner cylinder 13 are tightened together by a tightening bolt 22, and a ring beam is separated form the inner cylinder 13. After a working face 30 is drilled by a predetermined amount by a rotating cutter 3, a shield jack 17 is contracted, and a large-diameter segment is assembled at a shield tale 11. A shield propelling force is supported on the large-diameter segment, the inner cylinder 13, and the small-diameter segments 20, a shield machine 1 is propelled by expansion of the shield jack 17, and a largediameter backfill member is injected between the natural ground and the large-diameter segment through a backfill injection pipe 23 to construct a large-diameter tunnel. Therefore, shield tunnels with different shaft diameters can be constructed using a single shield machine.;COPYRIGHT: (C)1997,JPO